イヌ複根歯における根端切除後の組織の動態について

スポンサーリンク

概要

• 論文の詳細を見る

• This study was designed to investigate the wound healing process of the residual pulp, bone defect and apical seal after mesial apicoectomy in the dog lower mandibular third and fourth premolar. Twenty six dogs were used, and the hydroxyapatite (HAP) granules were filled in the wound cavities of eight dogs. In this model, periapical tissues and pulp were histopathologically and radiographically observed between 7 to 120 days. The results were as follows : 1. In the apicoectomized group, the wound cavity was repaired with newly formed alveolar bone after about 30 days. The orifice of root canals was spontaneously closed with hard tissues after about 90 days. 2. The canal orifice was closed in either of the two type : Type I by the addition of bone-like cementum to the root canals and type II by hypertrophy of the central root canal wall. 3. Type I closure was predominant in young teeth with a large pulp and a large root canal foramen. Both type I and type II had a similar incidence in mature teeth with narrowed pulp and root canal foramen. 4. In the HAP-filled group, the canal orifice was spontaneously closed with hard tissue after 90 days, similar to the apicoectomized group. Although both types of closure were also seen in this group, postoperative formation of the periodontal membrane was not seen and wound healing tended to be delayed in this group. 5. The incidence of type I closure of young teeth did not significantly differ between the HAP-filled group and the apicoectomized group. However, the incidence of type II closure of mature teeth was markedly higher in the HAP-filled group, as compared to the apicoectomized group. 6. It is seemed that type I closure occurs in cases where blood is adequately supplied from the pulp of the unoperated healthy root to the pulp of the root canal and from the wound cavity to the pulp, and that type I closure occurs in cases where blood supply to these regions is inadequate. 7. A single nerve fiber began to grow from the vicinity of the wound cavity 7 days after apicoectomy. Nerve fibers had grown into the wound cavity by the 21st day after apicoectomy. 8. As compared to the HAP-non filled group, the HAP-filled group had less nerve fasciae between HAP granules and between granulation tissues of the bone trabeculae, resulting in delayed healing.

• 福岡歯科大学学会の論文
• 1995-09-30

著者

• 近藤 健之

  福岡歯大・保存I

• 近藤 健之

  福岡歯科大学保存学第1講座

関連論文

• 10.窩洞形成後のラット象牙芽細胞突起の電顕的観察(第22回福岡歯科大学学会抄録)
• 窩洞形成後のラット象牙芽細胞突起の電顕的観察
• 1-4.メルコックス・ローダミン法による辺縁漏洩試験 : 漏洩経路について(第21回福岡歯科大学学会抄録)
• 1-10 Base材の抗菌性について(第20回福岡歯科大学学会総会抄録)
• 福岡歯科大学付属病院における患者の統計的観察(昭和60年〜平成元年度)(第91回福岡歯科大学学会例会)
• 12.Microconservative Restoration : 隣接面齲蝕に対する内部(トンネル)窩洞について(第18回 福岡歯科大学総会抄録)
• 11.試作直接覆髄剤の硬組織形成に関する電顕的研究(第18回 福岡歯科大学総会抄録)
• イヌ複根歯における根端切除後の組織の動態について
• イヌ複根歯における根端切除後の根尖組織の動態について
• 5.複根歯における根端切除後の組織の動態について(第108回福岡歯科大学学会例会)

スポンサーリンク